These are 8" (20cm) long jumper wires terminated as male to female. Use these to jumper from any male or female header on any board. Multiple jumpers can be connected next to one another on a 0.1" header. Comes in one pack of 40 jumpers (colors shown). Each group of jumpers are connected to each other and can either be pulled apart in any quantity (from 1-40, of course) or kept whole based on you needs.

These jumper wires can be used for pretty much everything! They work great with breadboards, Arduinos, and really any 0.1" pitch prototyping board.